Active Autowerke BMW B58N M340i M440i GESI Catted Downpipe (2025 and newer) 335i Why Upgrade Your EcoBoost Downpipes

Why Upgrade Your EcoBoost Downpipes

15+ Horspower gains throughout RPM range

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This system uses factory style flanges making it a complete bolt on system that requires no cutting or welding

Direct bolt-on replacement for factory downpipes

Active Autowerke BMW B58N M340i M440i GESI Catted Downpipe (2025 and newer) 335i Why Upgrade Your EcoBoost DownpipesNO PERFORMANCE TUNE NEEDED. Active Autowerke BMW B58N Gen 3 Catted Downpipe this is for M340 and M440 B58N Gen 3 which also incorporates a new GPF into the downpipe. NOTE that to remove the stock GPF downpipe requires 9 to 10 hours of labor as the subframe needs to be dropped. NOTE: Fitment applies to US model cars only unless specifically stated. We cannot guarantee fitment to non US model cars. BMW introduced a new valvetronic, single turbo version